跨多个函数访问类指针

我遇到了一个问题，我一直在努力提高代码的效率。我已经创建了一个Vector类，需要用它做一些基本的计算。使用向量库是不可能的，我需要创建自己的向量库。我现在的问题是数学的最后阶段。我可以输入第一个和第二个向量的值，但将它们相加后，我得到的是完全随机的数字。我正在发布我的头文件和我的cpp文件-任何帮助都将不胜感激！！

Vectors.h

#include <math.h>
#include <iostream>
class Vectors
{
public:
    Vectors(void);
    ~Vectors(void);
    Vectors(double a1, double b1, double c1, double d1)
    {
        a = a1;
        b = b1;
        c = c1;
        d = d1;
    }
    void VectorAdd(Vectors vector1, Vectors vector2);
    void VectorSub();
    void VectorMulti();
    void VectorDiv();
    void VectorDP();
    void VectorCP();
    void setV1(Vectors &vector1);
    void setV2(Vectors &vector2);
private:
     double a;
     double b;
     double c;
     double d;
     double cp;
};

Cpp文件

void Vectors::setV1(Vectors &vector1)
{
    Vectors *Vector1 = new Vectors();
    std::cout << "Enter the values of the first vector please.n";
    std::cout << "a1: ";
    std::cin >> Vector1 -> a;
    std::cout << "b1: ";
    std::cin >> Vector1 -> b;
    std::cout << "c1: ";
    std::cin >> Vector1 -> c;
    std::cout << "d1: ";
    std::cin >> Vector1 -> d;
    Vector1 = &vector1;
    std::cin.get();
    std::cin.get();
}
void Vectors::setV2(Vectors &vector2)
{
    Vectors *Vector2 = new Vectors();
    std::cout << "Enter the values of the first vector please.n";
    std::cout << "a1: ";
    std::cin >> Vector2 -> a;
    std::cout << "b1: ";
    std::cin >> Vector2 -> b;
    std::cout << "c1: ";
    std::cin >> Vector2 -> c;
    std::cout << "d1: ";
    std::cin >> Vector2 -> d;
    Vector2 = &vector2;
    std::cin.get();
    std::cin.get();
}
void Vectors::VectorAdd(Vectors vector1, Vectors vector2)
{
    setV1(vector1);
    setV2(vector2);
    Vectors *Vector3 = new Vectors();
    std::cout << "Here is the combination of the two vectors.n";
    Vector3 -> a = vector1.a + vector2.a;
    std::cout << "a3: " << Vector3 -> a;
    Vector3 -> b = vector1.b + vector2.b;
    std::cout << "nb3: " << Vector3 -> b;
    Vector3 -> c = vector1.c + vector2.c;
    std::cout << "nc3: " << Vector3 -> c;
    Vector3 -> d = vector1.d + vector2.d;
    std::cout << "nd3: " << Vector3 -> d;
    std::cin.get();
    std::cin.get();
}

提前谢谢！